1. In the figure shown, all four charges (+0. +0, -q, and -q) are situated at the corners of a square. The net electric force charge +Q is zero. (a) Express the magnitude of q in terms of Q. (b) Is the net electric force on each charge -q also equal to zero? Justify your answer. (c) Determine the electric field at the center of the square. +Q 4- --..... q0-- - -- O+